Functions of the Stomach

Controls Rotting and Ripening of Food

  1. Stomach transforms the food and drink we ingest. "Rotting and ripening" is the process of fermentation which prepares the way for the Spleen to extract the refined essence from food.
  2. After the refined part of the food and fluids has been extracted by the Spleen, the Stomach passes the remainder to the Small Intestine for further separation and absorption.

Controls Transportation of Food Essences

  1. Together with the Spleen, the Stomach controls the transportation of the food essence to the whole body including limbs.
  2. Stomach affects tongue coating.

Controls the Descending of Qi

Stomach sends the transformed food down to Small Intestine for further separation. Therefore, in health, Stomach Qi moves downwards. If Stomach Qi fails to descend, food can stagnate in Stomach and cause feelings of fullness/distention, sour regurgitation, belching, hiccup, nausea and vomiting.

Causes of Stomach Qi failing to descend:

  1. Overeating, which "overwhelms" Stomach
  2. Liver invading Stomach (Five Element scenario)

Stomach is the Origin of Fluids

  1. Stomach needs plenty of fluids in order to perform its rotting and ripening function.
  2. Fluids themselves are actually derived from ingested food and fluids.

In the Nei Jing, it states: "The Stomach likes wetness and dislikes dryness."

If Stomach fluids are abundant, digestion will be good, sense of taste will be normal. Deficient Stomach fluids (Deficient Stomach Yin): poor digestion, thirst, dry, cracked tongue.

Causes of deficient Stomach fluids:

  1. Eating large meals late at night
  2. Deficiency of Kidney Yin, or from long-term loss of fluids.

Stomach can suffer from Yin Deficiency (Deficient Fluids) or from Yang Deficiency (producing insufficient warmth to rot and ripen) or from Retention of Food (which can relate to either).

Stomach's Relationship with the Spleen

Stomach = Yang Earth. Spleen = Yin Earth. Close relationship Stomach Qi descends, Spleen Qi ascends.

Stomach likes wetness and dislikes dryness; Spleen likes dryness and dislikes wetness.

If Stomach too dry, Stomach Qi cannot descend and food cannot be moved down to Small Intestine. If Spleen too damp, Spleen Qi cannot ascend and fluids and food cannot be transformed. Stomach easily suffers from Excess, Spleen easily suffers from Deficiency. Stomach is prone to Heat, Spleen is prone to Cold (producing Dampness). Stomach tends to suffer from Deficiency of Yin, Spleen tends to suffer from Deficiency of Yang.